Abstract
A variety of defects in continuous steel strip may result in a ccidents. Traditional MFL (Magnetic flux leakage) testing method can lead to large blind area because steel str ip is too broad to be rotated. A new MFL testing method that can inspect omni-directional cracks in steel strip is introduc ed in this paper. This method is characterized basically by t he deep saturation state of steel strip generated. The property of i nspection is investigated using 3-D finite element method. W aveform configurations of the experimental results agree with that o f the theoretical predictions. Automatic inspecting equip ment has been developed based on the new MFL method principle.
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